On Tuesday, Iceland Prime Minister Sigmundur Gunnlaugsson resigned over revelations of undisclosed investments in three of Iceland’s failed banks.

But the 11.5 million documents from the Panama law-firm Mossack Fonseca also expose shadowy dealings surrounding dictators and kleptocrats worldwide -- with 99% of the iceberg still submerged.

The material has been scrutinized by some 400 reporters for the past year, under the coordination of the International Consortium of Investigative Journalists. Bob speaks with the consortium's director, Gerard Ryle, about how the global investigation came together.

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